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Microstructure diagrams of Mentha haplocalyx with different drying methods: (1) ×400 times magnification; (2) ×1600 times magnification; (3) ×3000 times magnification; fresh = fresh sample; 35 °C = 35 °C hot air drying; 45 °C = 45 °C hot air drying; 55 °C = 55 °C hot air drying.
